* Ivorian chalks up 151st Chelsea goal* Drogba overtakes Osgood and BentleyDIDIER Drogba became Chelsea’s fourth highest all-time scorer when he bagged the second goal in their 3-0 victory over Bolton Wanderers in the Premier League on Saturday.The Ivory Coast striker headed in a left-wing corner from Frank Lampard in the 61st minute to reach 151 goals for the Stamford Bridge club, one more than Peter Osgood and Roy Bentley.Only Lampard, who also netted on Saturday to take his tally to 182, Kerry Dixon (193) and Bobby Tambling (202) have scored more goals for Chelsea.Drogba, 33, who joined the London club from Olympique Marseille in 2004, limped off with an injury late in the game and is a doubtful for Ivory Coast’s midweek international friendly against Guinea in Abidjan.Chelsea’s victory over second-from-bottom Bolton eased the pressure on manager Andre Villas-Boas who recalled Lampard, Michael Essien and Ashley Cole to his team.The Portuguese was widely criticised in midweek after he left the experienced trio out of his starting lineup as the side were beaten 3-1 by Napoli in their Champions League first knockout round first-leg tie in Italy.